From Dr. Roy Spencer’s Global Warming Blog

by Roy W. Spencer, Ph. D.

2024 Sets New Record for Warmest Year In Satellite Era (Since 1979)

The Version 6.1 global average lower tropospheric temperature (LT) anomaly for December, 2024 was +0.62 deg. C departure from the 1991-2020 mean, down slightly from the November, 2024 anomaly of +0.64 deg.

The Version 6.1 global area-averaged temperature trend (January 1979 through December 2024) remains at +0.15 deg/ C/decade (+0.22 C/decade over land, +0.13 C/decade over oceans).

As seen in the following ranking of the years from warmest to coolest, 2024 was by far the warmest in the 46-year satellite record averaging 0.77 deg. C above the 30-year mean, while the 2nd warmest year (2023) was +0.43 deg. C above the 30-year mean. [Note: These yearly average anomalies weight the individual monthly anomalies by the number of days in each month.]

The following table lists various regional Version 6.1 LT departures from the 30-year (1991-2020) average for the last 24 months (record highs are in red).

YEAR	MO	GLOBE	NHEM.	SHEM.	TROPIC	USA48	ARCTIC	AUST
2023	Jan	-0.06	+0.07	-0.19	-0.41	+0.14	-0.10	-0.45
2023	Feb	+0.07	+0.13	+0.01	-0.13	+0.64	-0.26	+0.11
2023	Mar	+0.18	+0.22	+0.14	-0.17	-1.36	+0.15	+0.58
2023	Apr	+0.12	+0.04	+0.20	-0.09	-0.40	+0.47	+0.41
2023	May	+0.28	+0.16	+0.41	+0.32	+0.37	+0.52	+0.10
2023	June	+0.30	+0.33	+0.28	+0.51	-0.55	+0.29	+0.20
2023	July	+0.56	+0.59	+0.54	+0.83	+0.28	+0.79	+1.42
2023	Aug	+0.61	+0.77	+0.45	+0.78	+0.71	+1.49	+1.30
2023	Sep	+0.80	+0.84	+0.76	+0.82	+0.25	+1.11	+1.17
2023	Oct	+0.79	+0.85	+0.72	+0.85	+0.83	+0.81	+0.57
2023	Nov	+0.77	+0.87	+0.67	+0.87	+0.50	+1.08	+0.29
2023	Dec	+0.75	+0.92	+0.57	+1.01	+1.22	+0.31	+0.70
2024	Jan	+0.80	+1.02	+0.58	+1.20	-0.19	+0.40	+1.12
2024	Feb	+0.88	+0.95	+0.81	+1.17	+1.31	+0.86	+1.16
2024	Mar	+0.88	+0.96	+0.80	+1.26	+0.22	+1.05	+1.34
2024	Apr	+0.94	+1.12	+0.77	+1.15	+0.86	+0.88	+0.54
2024	May	+0.78	+0.77	+0.78	+1.20	+0.05	+0.22	+0.53
2024	June	+0.69	+0.78	+0.60	+0.85	+1.37	+0.64	+0.91
2024	July	+0.74	+0.86	+0.62	+0.97	+0.44	+0.56	-0.06
2024	Aug	+0.76	+0.82	+0.70	+0.75	+0.41	+0.88	+1.75
2024	Sep	+0.81	+1.04	+0.58	+0.82	+1.32	+1.48	+0.98
2024	Oct	+0.75	+0.89	+0.61	+0.64	+1.90	+0.81	+1.09
2024	Nov	+0.64	+0.88	+0.41	+0.53	+1.12	+0.79	+1.00
2024	Dec	+0.62	+0.76	+0.48	+0.53	+1.42	+1.12	+1.54

The full UAH Global Temperature Report, along with the LT global gridpoint anomaly image for December, 2024, and a more detailed analysis by John Christy, should be available within the next several days here.

The monthly anomalies for various regions for the four deep layers we monitor from satellites will be available in the next several days at the following locations:

Lower Troposphere

Mid-Troposphere

Tropopause

Lower Stratosphere

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